Created
July 30, 2019 00:08
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| private static func animationsForAlphaSwap(forKeyPath keyPath: String, | |
| fromValue: Any?, | |
| toValue: Any?)->[CABasicAnimation] { | |
| let duration = CATransaction.animationDuration() | |
| guard duration > 0 else { return [CABasicAnimation]() } | |
| let alphaSwapDuration = min(LabelLayerFromToAlphaSwapAnimationDuration, 0.5 * duration) | |
| let alphaPersistDuration = (duration - alphaSwapDuration) / 2.0 | |
| let persistFromAlphaAnimation = CABasicAnimation(forKeyPath: keyPath, | |
| fromValue: fromValue, | |
| toValue: fromValue, | |
| duration: alphaPersistDuration) | |
| let swapAlphaAnimation = CABasicAnimation(forKeyPath: keyPath, | |
| fromValue: fromValue, | |
| toValue: toValue, | |
| duration:alphaSwapDuration) | |
| let persistToAlphaAnimation = CABasicAnimation(forKeyPath: keyPath, | |
| fromValue: toValue, | |
| toValue: toValue, | |
| duration:alphaPersistDuration) | |
| persistFromAlphaAnimation.beginTime = 0 | |
| swapAlphaAnimation.beginTime = alphaPersistDuration | |
| persistToAlphaAnimation.beginTime = alphaSwapDuration + alphaPersistDuration | |
| return [persistFromAlphaAnimation, | |
| swapAlphaAnimation, | |
| persistToAlphaAnimation] | |
| } |
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